I have also had this Pentair Rebel for about the 3rd Season, and up till now I have replaced the drive spool on this 3 times already do to the same condition and problems that others have experienced! I run my vacuum for 6 hrs a day on the lowest setting speed on my pentair Intelliflo vs --- Pump. The splines get worn to easily! After that will be the teeth on the wheels itself tend to make a wear pattern. It would be nice if these drive parts could be made out of a more durable plastic or polycarbonate!